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Frequency and Reliability Analysis of Load-Bearing Composite Beams

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Abstract

The increasing utilization of fiber-reinforced thermoplastics (FRTPs) as a substitute for metal in load-bearing structures poses challenges related to NVH issues arising from frequency variations and reliability concerns stemming from fiber dispersion within the resin matrix. In this study, the steel automobile seat beam serves as a benchmark for comparison. FRTP beams are designed and fabricated using two distinct processes: compression molding and injection over-molding. Subsequently, their modal frequency and reliability are meticulously analyzed. Experimental investigations are conducted to explore the influence of various factors, including the combination of laminates and ribs, as well as the stacking sequence of laminates, on the modal frequency. The findings reveal that the modal frequency and vibration mode are subject to alterations based on the fiber type, beam material, and laminate stacking sequence. Notably, in comparison to the steel benchmark, the first-order frequency of the FRTP beam in this study experiences a 6.59% increase while simultaneously achieving a weight reduction of 32.42%. To assess reliability, a comprehensive analysis is performed, considering a six-fold standard deviation. This analysis yields the permissible range of fluctuation for material elastic constants, bending performance, and frequency response. Encouragingly, the FRTP beams meet the required reliability criteria. These results provide valuable insights for comprehending the stiffness-dependent response and effectively controlling structural performance when implementing FRTP for weight reduction purposes.

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Abbreviations

CF:

Carbon fiber

CF30-PA6:

Continuous 30% volume fraction carbon fiber-reinforced PA6

FRTP:

Fiber-reinforced thermoplastics

GF:

Glass fiber

GF30/PA6:

Discontinuous 30% volume fraction glass fiber-reinforced PA6

PA6:

Polyamide 6

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Acknowledgements

This work was supported by the National Natural Science Foundation of China [Nos. 52072019, U1664250 and 51575023].

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Authors and Affiliations

  1. School of Transportation Science and Engineering, Beihang University, 37 Xueyuan Road, Haidian District, Beijing, 100191, China

    Junlei Wei, Lingyu Sun, Xinli Gao, Wenfeng Pan, Jiaxin Wang & Jinxi Wang

  2. Beijing Key Laboratory for High-Efficient Power Transmission and System Control of New Energy Resource Vehicle, Beihang University, 37 Xueyuan Road, Haidian District, Beijing, 100191, China

    Junlei Wei, Lingyu Sun, Xinli Gao, Wenfeng Pan, Jiaxin Wang & Jinxi Wang

  3. Beijing Hangshu Vehicle Data Research Institute Co., Ltd., Beijing, 100062, China

    Lingyu Sun

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  1. Junlei Wei
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  5. Jiaxin Wang
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Contributions

Lingyu Sun: Conceptualization, Methodology, Supervision. Junlei Wei: Data curation, Writing-Original draft preparation, Methodology, Writing-Reviewing and Editing. Xinli Gao: Methodology, Writing-Reviewing and Editing. Wenfeng Pan: Writing-Reviewing and Editing. Jiaxin Wang: Writing-Reviewing and Editing. Jinxi Wang: Writing-Reviewing and Editing.

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Correspondence to Lingyu Sun.

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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Wei, J., Sun, L., Gao, X. et al. Frequency and Reliability Analysis of Load-Bearing Composite Beams. Automot. Innov. 7, 194–207 (2024). https://doi.org/10.1007/s42154-023-00233-4

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  • DOI: https://doi.org/10.1007/s42154-023-00233-4

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